Experimental system for coupling of seepage and stress in rock tensile state

Abstract

The invention discloses an experimental system for coupling of seepage and stress in a rock tensile state. The system comprises an oil pressure chamber, a tension device and a computer, wherein a top cover and a bottom cover are arranged on the oil pressure chamber, wherein positions of the bottom cover and the oil pressure chamber are fixed; the top cover can slide relative to the oil pressure chamber; the top cover is also used for clamping the upper end of a test sample as a test sample upper end cover; the bottom cover is used for clamping the lower end of the test sample as a test sample lower end cover and forms a sealed seepage chamber together with the lower end of the test sample; the sealed seepage chamber is communicated with a water inlet pipe; the top cover is communicated with a water outlet pipe; the oil pressure chamber is communicated with an oil pipe; the tension device is connected with the top cover; and the computer is used for controlling an oil pump, a water inlet pump and a water outlet pump as well as a flowmeter and extracting data information. The experimental system disclosed by the invention has the advantages as follows: variation process and rule of rocks under a tensile stress and seepage coupling effect can be studied; a seepage and stress coupling mathematical model capable of describing stress, strain and seepage coefficient evolution rules of the rocks is established; and a seepage failure mechanism of a project is studied from a microscopic angle.

Description

technical field [0001] The invention relates to a test system under complex stress-seepage conditions, in particular to a stress-seepage coupling test system for rocks in tension. Background technique [0002] In geotechnical engineering design and construction, the tensile strength of rock is an important mechanical index. In actual engineering, the rock mass is often in a complex stress state, some parts are in a compressive stress state, and some places are in a tensile stress state. Since the tensile strength of the rock is much lower than the compressive strength, the surrounding rock is always under tension. The stress zone begins to fail. Therefore, the correct regional division of the stress state of the surrounding rock mass, that is, the determination of the failure risk zone is the key to the analysis and evaluation of the stability of the surrounding rock, and the rock tensile strength is one of the basic data for determining the failure zone of the engineering ...

AI Technical Summary

Problems solved by technology

[0005] On the basis of referring to domestic and foreign materials, the original series of related test devices, such as Chinese patent CN102607950 and Chinese patent 200710040457.5, etc., involve seepage stress coupling, but these couplings are all under the effect of confining pressure or shear seepage under action without taking into account the stretching

Images